Aquasure Harmony 64K
A cheap way to get a large metered softener for a big household or very hard water. Capacity and salt use rest on the maker’s word alone.
Amazon $749.99$749.99
The Aquasure Harmony 64K is the better water softener overall, rated 3.2 to 3.1. The Aquasure Harmony 64K leads on value. The Aquasure Harmony 64K costs $145.01 less ($749.99 vs $895).
AFWFilters Fleck 5600SXT 64K
A low cost large capacity Fleck softener for big households or very hard water, for buyers comfortable with an uncertified, seller-built system.
Amazon $895$895
Prices were last checked November 1, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Aquasure Harmony 64K for value ($11.72 per 1,000 grains ($749.99, 64,000 grains) vs $13.98 per 1,000 grains ($895, 64,000 grains)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every over 48,000 grains water softener; a clear win is highlighted. How we rank explains each one.
| Factor weight | Aquasure Harmony 64K | AFWFilters Fleck 5600SXT 64K |
|---|---|---|
| Overall rating | 3.2/5 | 3.1/5 |
| Value 30% | 66 $11.72 per 1,000 grains ($749.99, 64,000 grains) | 51 $13.98 per 1,000 grains ($895, 64,000 grains) |
| Salt efficiency 20% | 50 salt efficiency not published (neutral score used) | 50 salt efficiency not published (neutral score used) |
| Flow 15% | 50 service flow not published (neutral score used) | 50 service flow not published (neutral score used) |
| Warranty 25% | 44 5 years on the valve, 10 years on the tanks | 50 warranty not published (neutral score used) |
| Certification 10% | 0 not certified to NSF/ANSI 44 | 0 not certified to NSF/ANSI 44 |
Specifications
| Aquasure Harmony 64K | AFWFilters Fleck 5600SXT 64K | |
|---|---|---|
| Capacity | ||
| Rated capacity | 64,000 grains | 64,000 grains |
| Resin | 2 cu ft | 2 cu ft |
| Control | ||
| Valve | Aquatrol digital metered | Fleck 5600SXT |
| Regenerates on demand | Yes | Yes |
| App or remote monitoring | No | No |
| Bypass valve included | Yes | Yes |
| Resin tank | 12 x 52 in | - |
| Certification and warranty | ||
| NSF/ANSI 44 | No | No |
| Valve warranty | 5 years | - |
| Tank warranty | 10 years | - |